What if its 15 to the negative 4 ?

by Chrissy
(Houston , Texas)

I don't understand what do you do if it is 15 to the negative (-) 4 ? Please help me ! Thank you .

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What if its 15 to the negative 4 ?

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Mar 23, 2011
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starstarstarstarstar 		Negative exponents
by: Karin

Chrissy,

I'm sorry to respond to this so late, I didn't realize that this submission had come through.

15^-4 looks difficult, but we can make the exponent positive to make this problem a lot easier.

When you raise a number to a negative power, you want to take the reciprocal of the number and this will make the exponent positive.

15^-4 = (1/15)^4.

Take the reciprocal of 15 (1/15) and then raise this to the fourth power.

So, (1/15)^4 is 1/50625.

Take a look at the lesson on the following webpage:
http://www.algebra-class.com/negative-exponents.html

I hope this helps,
Karin

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